Hungary, Poland, Slovakia, and the Czech Republic -- the so-called Visegrad Four countries -- say they will boycott this weekend’s European summit on migration, saying it is not the appropriate format for such talks.

The four states oppose calls from Western EU counterparts, particularly Germany, for all member states to "share the burden" and accept a quota of migrants who have entered the EU since 2015.

German Chancellor Angela Merkel has pressed for the emergency meeting on June 24 in Brussels ahead of a full EU summit on June 28-29.